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Process for manufacturing semiconductor device including lamp annealing

Image Number 3 for United States Patent #6784058.

A process for a semiconductor device includes the following steps applied to a silicon substrate wherein a floating gate electrode having sidewalls is formed above the semiconductor substrate with a tunnel oxide film intervened and wherein active regions are arranged in places adjoining both sides of floating gate electrode, as seen from above, and arsenic is injected into said active regions as an impurity: the lamp annealing step of carrying out a heat treatment in the atmosphere of a first gas mixture which includes nitrogen and oxygen; and the oxygen film formation step of carrying out a heat treatment in the atmosphere of a second gas mixture which includes oxygen so as to form an oxide film on sidewalls of floating gate electrode after the lamp annealing step.

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